Gas-engine.



E HANSEN.

GAS ENGINE APPLICATION FILED FEB. II. 1915.

Patented Nov. 30, 1915.

3 SHEETS-SHEET W/ T/VEE/EEE AZ/Lm E. HANSEN.

GAS ENGINE.

APPLICATION FILED FEB. 17, 1915.

mmm, Patented NOV. 30, 1915.

3 SHEETS-SHEET 2.

GAS ENGINE. APPLICATION FILE-D FEB. 17, I915- 1,162,054.

30, 1915. 3 SHEETS-SHEET 3.

7' {ill I i v Patented Nov.

\ f VE TOP? WITNESSES.

- A T TQHNE Y5 EIMER HANSEN, 0F RACINE, WISCONSIN.

GAS-ENGINE.

Specification of Letters Patent.

Patented Nov. 30, 1915.

Application filed February 17, 1915. Serial No. 8,712.

To all whom itmay cohcem:

Be it known that'I, ELMER HANSEN, -a citizen of theUnited States, andresident of Racine, in the county of Racine and State of- Wisconsin,have invented new and useful Improvements in Gas-Engines, of which thefollowing is a description, reference being had to the accompanyingdrawings, which are apart of this specification.

' This invention relates to internal combustion engines.

The invention designs more particularly to provide an internalcombustion engine with a new and improved form of sleevevalve. r

Theinvention further designs to provide a sliding sleeve and asupplemental piston to operatethe'valves of the engine whichsupplemental piston also furnishes power to the engine.

The invention further designs to provide a sleeve-valve concentric withthe cylinder of the engine and surrounding the engine piston and asupplemental piston alsosurrounded by the sleeve and cooperatingtherewith to actuate the valve.

The invention further designs to-provlde an engine having main andsupplemental: pistons to increase the stroke of the engine saidsupplemental pistons cooperating with the valve-sleeve to open and closethe exhaust and inlet ports.

' The invention further designs to provide a sleeve-valveconcentric withthe cylinder of the engine and surrounding the engine piston asupplemental piston disposed above the main piston and working withln'the sleeve, a crank shaft for the engine piston and a valve shaft-forthe supplemental piston and valve-sleeve parallel to the engine crankshaft, so that an engine of substantially perfect balance is produced.

The invention further designs to provide a new and improved form ofinternal combustion engine.

The invention consists in the several features hereinafter set forth andmore particularly defined by claims at the conclusion hereof. 4

In the drawings: Figure' 1 is a vertical sectional view of the engineembodying the invention; Fig. 2 is a section taken on the line 22 ofFig. 1 showing the position of the parts at the end of the compressionstroke ;-'F ig.- 3 is a section taken on the line 33 of Fig. 1; Fig. 4is a section taken on the line 4-4.- of Fig. 1.

The drawings show the invention applied to an engine of the four cycletype but it will be understood that it may be used on other types ofengines. The cylinder casing A'of the engine i provided with cylindersB, C, D and E, the walls of which are water-cooled. Eightinl'et ports Fand a similar number of exhaust ports G are provided in each cylinderandare situated preferably toward the upper end of the cylinder. Waterjackets H and- I are interposed between the inlet and exhaust portsrespectively to cool the gases passing through the ports. A water cooledpartition J is interposed between the exhaust and inlet ports in eachcylinder.

Each cylinder is provided with a sleeve 5 concentrically mounted to.slide therein and extending the length of and somewhat below and abovethe cylinder. -The sleeve 5 is provided with apertures 6 which arepositioned to register with either the eX- haust or inlet ports underproper conditions. Each of the upper ends of the sleeves :5 have flanges7 and means hereinafter described are provided for operating saidsleeves.

' concentrically mounted to slide in the sleeves are the main enginepistons 8 having the usual rings 9 mounted thereon and a concave head 8.-Pitmen 10 pivotally connect the pistons ,8 with a crank shaft 11 whichhas its ends journaled in a crank case 12 upon which the cylinder casingis mounted. The crank shaft 11 carries a fly wheel 13 and a sprocketwheel 14.

Concentricallymounted to slide in the sleeves at theupper end thereofand in a shaft.

form a driving connection between the supplemental pistons and theengine crank The means for operating the sleeves '5 comprises aplurality of pairs of eccentrics 22- mounted on the valve shaft 19, aplurality of pairs of eccentric'straps 23 mounted on said eccentrics andwhose ends 24 are pivotally secured to said sleeves by pins 25 mountedin the flanges '7 of the sleeves. A brace bar 26 is secured to thecylinder casing A and forms at its ends supporting bearings for theintermediate portion of the valve shaft 19 and crank shaft 11. A cover27 rests upon the upper end of the cylinder casing and incloses theoperating parts of the valve gear mechanism.

From the foregoing it will be noted that the valve sleeves areconcentrically arranged to slide in the cylinders, the main andsupplemental pistons are concentrically arranged to slide in the sleevesand the shaftfor operating the sleeves and the supplemental pistons aredisposed directly above said parts and in the same vertical axis as thecrank shaft of the engine and parallell-y disposed with respect theretothus producing an engine of fine balance of parts.

The operation of the engine may be best described with reference toFig. 1. The en gine is timed to fire in the following order cylinders B,D, E,C. In Fig. 1 in cylinder B firing has taken place and the exhaustis just about to start, the piston 8 has moved down in the sleeve to itslowest position; the supplemental piston has moved up the sleeve but notsufficiently to open the exhaust G and the sleeve 5 has moved upwardlyso that its apertures 6 are in registerwith the exhaust ports. At thistime cylinder D has just furnished its exhaust stroke and is starting.suction, the piston 8 has commenced to move down in the sleeve, thesleeve has moved down in the cylinder closing off the exhaust ports andthe piston 15 is also moving down. At this time also the cylindervEhas'just finished its suction stroke and is about to start compression,the piston 8 has moved down to its lowest position and the piston 15 ismoving-down and thesleeve 5 moving up to close the intake ports. At thesame time the cylinder C has just finished compression and explosion isabout to take place,-the pistons 8 and 15 are close together their heads8 and 17 with a small exposed portion of the interior of the sleeveforming the explosion chamber and the sleeve 5 has moved up to close offthe intake ports. Thus the sleeves and the supplemental pistonscooperate to open and close the exhaust ports and the supplementalpistons also being acted upon by the charge transmit power from thevalve shaft 19 to the main crank -.-shaft 11 which thus increases thestroke of the engine and produces more power and also a bettercompression due to the pistons 8 and 15 working against each other onthe compression stroke. Furthermore the movement of the supplementalpistons 15 are so timed with relation to the movement of the mainpistons 8 that the pistons 15 have moved down to-their lowest positionbefore explosion and are moving up with the pistons 8 immediately beforeexplosion takes place thus insuring movement of the two pistons upon thesleeve during firing to prevent any carbon forming on the sleeve and thepistons come so close together at the time of explosion that there islittle chance of the lubricating oil within the sleeve burning and thereis consequently the moving parts.

A further advantage of the present construction is that the singlesleeve is provided with but one set of apertures so that when either theexhaust or inlet are exposed the other will not be and consequently theinlet will not be hindered by the action of the ex haust.

The crank shaft and the valve shaft are geared two to one so that thevalve shaft revolves once to two revolutions of the crank shaft so thatthe pistons come together only during the firing stroke. A

The invention thus exemplifies a new and improved internal combustionengine in which the valve mechanism consists of. a

sleeve valve and a supplemental piston which also coiiperates with themain piston to increase the stroke and power of the engine. 1

#What I claim as my invention is:

1. In an internal combustion engine, the combination of a cylinderhaving inlet and exhaust ports, a sleeve-valve concentrically mounted toslide within said cylinder, an engine piston concentrically mounted tocontact with and slide within said sleevevalve, and a supplementalpiston concentrically mounted to contact with and slide within saidsleeve-valye and coacting with said sleeve valve-to open and close saidports.

2. In an internal combustion engine, the combination of a cylinderhaving inlet and exhaust ports, a sleeve concentrically mounted to slidewithin said cylinder and having a plurality of apertures positioned inthe same plane and adapted to register with either said inlet or exhaustports, an engine piston concentrically mounted to contact with and slideWithin said sleeve, and a supplemental piston concentrically mounted tocontact with and slide within said sleeve and coacting with said sleeveto open and close said ports.

3. In an internal combustion engine, the

centrically mounted to slide within said cylinder, an engine pistonconcentrically good lubrication of mounted to contact with and slidewithin said sleeve-valve, and a supplemental piston concentricallymounted to contact with and slide within said sleeve-valve and 'coactingwith said sleeve valve to open and close said ports, said supplementalpiston, sleevevalve and engine piston cooperating to form an explosionchamber.

4. In an internal combustion engine, the combination, with a cylinderhaving inlet and exhaust ports, a crank shaft and a valve shaft, of asleevevalve slidably mounted in said cylinder, an engine piston slidablymounted in said sleeve-valve and directly contacting therewith andoperatively connected to said crank shaft, a supplemental pistonslidably mounted in said sleeve and directly contacting therewith andoperatively connected to said valve shaft and cooperating with saidsleeve-valve to open and close said ports, means for operativelyconnecting said sleeve-valve with said valve shaft, and a drivingconnection between said crank shaft and valve shaft.

5. In an internal combustion engine, the

in said cylinder, means foroperatively con-.-

necting diametrically opposite portions of said valve to said valveshaft, an engine piston slidably and concentrically mounted withinsaidsleeve and directly contacting therewith, a supplemental piston.slidably and concentrically mounted within said sleeve and directlycontacting therewith, a driving connection between'said crank shaft andengine piston, and a driving connection between said valve shaft andsupplemental piston, said crank shaft and valve shaft being disposedsubstantially parallel to each other and in the same vertical plane.

In testimony whereof, I-aiiix my signature, in presence of twowitnesses.

ELMER HANSEN.

